MIVII3000E00HI00 General Electric A Legacy Numerical Voltage And Frequency Protection Relay For Control The Speed And Torque Of AC Motors
The GE Multilin MIVII3000E00HI00 is an industry-trusted, legacy numerical voltage and frequency protection relay engineered to maintain grid stability and protect high-value power distribution systems. Unlike standard single-function monitors, this combined dual-element unit delivers instantaneous and time-delayed protection against complex under/over voltage and frequency fluctuations. It acts as a defense safeguard for industrial co-generation facilities, automatic transfer systems (ATS), utility substations, and large AC machinery vulnerable to catastrophic grid instability.
Engineer's Note
"When retrofitting grid interfaces or emergency generation systems, it is vital to know that the
MIVII3000E00HI00 is purely a distribution protection and monitoring relay, not an AC motor drive controller. While it shields large industrial AC motors from the harmful effects of underfrequency or severe voltage sags, it does not directly modulate torque or adjust rotor speed. For legacy systems requiring physical drive maintenance or component replacement, this drawout case unit allows for rapid drop-in field replacement without disturbing the factory terminal backplane wiring."
Project Case Study
"This specific MIVII3000E00HI00 protection relay configuration was successfully integrated into an automatic islanding grid system for a regional manufacturing plant in 2025. Facing inconsistent utility supply grids, the dual-element relay provided sub-cycle frequency drop tracking and voltage monitoring to safely trigger isolated breaker operations. Over an extended operational cycle, it protected the plant's large induction motor blocks from severe counter-torque stresses and phase damages during unexpected main grid blackouts."
Custom Product FAQ
Q: Can the MIVII3000E00HI00 be used as a Variable Frequency Drive (VFD) to adjust AC motor speeds?
A: No, the MIVII3000E00HI00 is entirely a numerical safety protection relay. It continuously tracks structural voltage and frequency thresholds. When values cross safe operation baselines, it isolates the grid or machine via trip contacts; it does not supply variable current or control torque output profiles.
Q: What is the mechanical benefit of the 'Drawout Case' design featured on this GE model?
A: The drawout design allows plant maintenance technicians to pull the inner functional relay chassis directly out of the mounting rack for testing or replacement. The backplane connections automatically short-circuit connected current transformers (CTs) safely, avoiding a system shutdown or manual wire labeling.
Q: If my facility uses a Modbus RTU communications framework, can this relay export data?
A: Yes, through its rear RS485 infrastructure channel, this Multilin model supports standard Modbus RTU communications. This enables real-time extraction of live grid voltage readings, historical event tracking metrics, and localized digital I/O statuses straight into your facility's central SCADA system.
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Amikon supplies industrial automation parts to more than 150 countries, covering a wide mix of regions.
The Americas: USA and Canada rely on replacement parts for older facilities like refineries or chemical plants.
Europe: Countries such as Germany, UK, France and Italy focus on keeping existing systems running rather than new installations.
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